Timing skew compensation technique using digital filter with novel linear phase condition

This paper describes the timing skew compensation technique using the digital filter with our novel linear phase condition. First we describe the digital filter which can set its group delay with the arbitrary fine time resolution while it maintains the linear phase characteristics; the conventional linear phase digital filter can set its group delay with the time resolution of a half of the sampling period. We will provide its structure and operation, theoretical analysis as well as simulation verification. Next we will describe the application of our proposed digital filter to compensate for timing skew in the following cases: (1) Sampling timing skew among channels in the time-interleaved ADC system. (2) I, Q-path timing skew in the single-side band (SSB) signal generator. We show its effectiveness with simulation.